The owners failed to report the reconstruction of the club’s basement as part of its recent renaming to “Steam Works” from “Apollo Splash Club”, according to the paper. Two exits in the basement were also blocked.

The cause of the fire has reportedly not yet been determined though two of the three victims who died of smoke inhalation have been identified — both were residents of Berlin though they came from Italy’s and Spain.

The police say the fire likely started out of negligence or a technical defect.